Optical DiagnosticsT. Tsang

BNL(Aug. 4, 2006)

Optical Diagnostics

• tight environment

• high radiation area

• non-serviceable area

• passive components

• optics only, no active electronics

• transmit image through flexible fiber bundle

Optical Diagnostics

test target

retroreflected illumination

Spherical mirror

laser illumination

image collection

Works OK in this tight environment

cm scale

Optical Diagnosticsoptical design in secondary containment

One set of opticsper viewport

Conceptual design completed

Sumitomo imaging fibers – used in oue setup

IGN-08/30 sample0.3-meter

30,000 pixels

Cost per foot $78 $158 $305

Cost in 10 meter $2574 $5214 $10065

Total cost for 4 fibers (40 meter) $10.3k $20.8k $40.3k

Rad-hard to 1 Mrad

Fujikura imaging fibers – Not used

Fujikura data, FIGH-30A continuous 20-meter fiber30,000 pixel imaging fiber

Cost per foot $85 $250 $540

Cost in 10 meter $2805 $8250 $17.8k

Total cost for

4 fibers (40 meter) $11.2k $33k $71.8k

unofficial price info

illumination uniformity

image after a continuous 20-meter long fiber Cost/foot $210 $371.4

Cost in 10 meter $6,935.65 $12,256.7

Cost in 20 meter $15,607.9

Total cost for

4 fibers (40 meter)

$27,742.6 $49,026.8

official price info

Image quality comparison

camera SMD illuminationNIR pulse, 10 us/frame

30,000 pixels, 1-mm diameter

Fujikura Sumitomo25 cm long 30 cm long

NO significant difference in image qualityShould go with Sumitomo fibers

(20 meters have been ordered)

$210/foot $78/foot delivery in 4 weeksdelivery in 3 months

FIGH-30-850N IGN-08/30

Grin objective lensimaging fiber – 1 mmillumination fiberfiber holder

All-in-one optical setup

July 2006Sumitomo IGN08/30 imaging fiber – 20-meter long

NIR 100 µs/frame static image800 x50 x

New baseplate on mock-up – SMD camera

dynamic image

SMD camera: NIR pulse 100 µs/frame

illumination fiber

imaging fiber

25 Watt pulsed NIR laser

one set of viewport optics

SMD camera

mock-up primary

stationary image

New baseplate on mock-up – FastVision camera

dynamic image

FastVision camera: NIR pulse 2 ms/frame

stationary image

• 10-meter imaging fibers will be assembled on mock-up primary• dynamic image collection on both viewports will be tested • 1st camera will be SMD CCD• 2nd camera will be FastVision CCD• 2 sets of viewport/optics/CCD will be ready by the end of August• 3 more 10-meter long imaging fibers in order – viewports 3rd & 4th

Summary